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  • https://math.libretexts.org/Courses/Georgia_State_University_-_Perimeter_College/MATH_2215%3A_Calculus_III/14%3A_Functions_of_Multiple_Variables_and_Partial_Derivatives/Directional_Derivatives_and_the_Gradient
    A function z=f(x,y) has two partial derivatives: z/x and z/y. These derivatives correspond to each of the independent variables and can be interpreted as instantaneous rates of change ...A function z=f(x,y) has two partial derivatives: z/x and z/y. These derivatives correspond to each of the independent variables and can be interpreted as instantaneous rates of change (that is, as slopes of a tangent line). Similarly, z/y represents the slope of the tangent line parallel to the y-axis. Now we consider the possibility of a tangent line parallel to neither axis.
  • https://math.libretexts.org/Courses/Misericordia_University/MTH_226%3A_Calculus_III/Chapter_14%3A_Functions_of_Multiple_Variables_and_Partial_Derivatives/3.12%3A_Directional_Derivatives_and_the_Gradient
    A function z=f(x,y) has two partial derivatives: z/x and z/y. These derivatives correspond to each of the independent variables and can be interpreted as instantaneous rates of change ...A function z=f(x,y) has two partial derivatives: z/x and z/y. These derivatives correspond to each of the independent variables and can be interpreted as instantaneous rates of change (that is, as slopes of a tangent line). Similarly, z/y represents the slope of the tangent line parallel to the y-axis. Now we consider the possibility of a tangent line parallel to neither axis.
  • https://math.libretexts.org/Courses/Montana_State_University/M273%3A_Multivariable_Calculus/14%3A_Functions_of_Multiple_Variables_and_Partial_Derivatives/Directional_Derivatives_and_the_Gradient
    A function z=f(x,y) has two partial derivatives: z/x and z/y. These derivatives correspond to each of the independent variables and can be interpreted as instantaneous rates of change ...A function z=f(x,y) has two partial derivatives: z/x and z/y. These derivatives correspond to each of the independent variables and can be interpreted as instantaneous rates of change (that is, as slopes of a tangent line). Similarly, z/y represents the slope of the tangent line parallel to the y-axis. Now we consider the possibility of a tangent line parallel to neither axis.

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